Dust-collector.



H. LBOHTBNBERG.

DUST COLLECTOR. APPLICATION P'ILED APILZQL 1914 1, 1 1 3,024. Patentedout. 6, 1914,

4 SHBETS- SHEET 1.

H. LBGHT ENBERG. DUST COLLECTOR.

APPLICATION FILED APILZQ. 1914 1,1 1 8,024. Patented Oct. 6. 1914.

MA ra H. LEGHTENBERG.

DUST COLLECTOR.

APPLICATION FILED APR.29.19l4

1,1 1 8,()24. Patented Oct. 6, 1914.

4 SHEETS-SHEET 3.

Z I; I h 7AM)? mm H. LEGHTENBERG.

DUST COLLECTOR.

APPLICATION FILED APE.29. 1914.

1, 1 1 3,024. Patented Oct. 6, 1914.

4 SHEETS-SHEET 4.

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HENRY LECH'I'ENBERG, OF QUINCY, ILLINOIS, ASSIGNOR TO W. T. LE CIITENBEBG."

DUST-COLLECTOR.

Specification of Letters Patent.

Patented Dot. 6, 1914.

Application filed April 29, 1914. Serial No. 835.118.

the principal object being to produce a dust collector which is soconstructed that the dust adhering to its filtering devices may beeasily and quickly removed.

The invention also includes details of construction which will behereinafter described. l

The preferred form of my invention prci' erably comprises filteringdevices arranged in a dust receiving housing suction pipes leading fromsaid housing, and a fun For;

drawing filtered air through said suction ipes. Each suction pipe isassociated with one of the filtering devices. hen the dust collector isin operation dust laden air is admitted to the dust receiving housingand the dust collects on the surface of the filtering devices while theair passing through the filtering devices is discharged into the suctionpipes. In cleaning the filtering devices one of the suction pipes 1sclosed to prevent the flow of air from the filtering elements to saidsuction pipe, and a reversely moving air current entering said suctionpipe flows through one of the filtering devices with the result ofremoving the dust from its filtering elements. The other filteringdevice may also be cleaned by closing its suction pipe and forcing airfrom said suction pipe into and through the filtering elementsassociated therewith.

Figure I is a top or plan view of my dust collector. Fig. II is u frontelevation. Fig. III is a side elevation. Fig. IV is a vertical sectionshowing one of the dust collecting screens. Fig. V is an enlargedvertical section taken approximately on line V-V, Fig. III. Fig. VI is adetail view showing the jarring devices at one side of the dust.receiving housing; 'Fig. VII is an enlarged front elevatiion, shoutingone of the suction pipes and the closure secured thereto, a. portion ofthe closure being broken away to show the inlet opening'in the suctionpipe. Fig. VIIIis'a side elevationof the parts shown in Fig. VII, thesuction pipe being shown in section. Fig. 1X is a detail View of theclutch and the drive wheels-for the arring devices.

In the accompanying drawings: 1 designotes a dust receiving housingprovided with an inlet opening 2, and 3 is u delivery pipe iorconducting dust laden air tothe inlet opening.

l and 5 designate outlet openings formed in the side Walls of thehousing 1 through" vhich the air is discharged from thehous ing. Suctionpipes (Sand 7 lead from the outlet openings to an exhaust fan 8.

9 designates a hopper arranged below the housing 1 and provided with adust receiw ug member 10 at its lower end. The filtermg devicespreferably comprise rectangular outer frames 12 mounted on :1 support'13and the filtering material preferahhvconsists of fabric wells 1% securedto said rec tanguler outer frames. Passegeweys 15 and 16 located in thefiltering devices are formed. 'by apertures in the fabric Webs 14 andinner frames 17 secured to said Webs. The outer frzunes 12 are separatedfrom each other to admit the dust laden air to the filtering materialand the inner frames 1'? are separated from each other as seen in Fig. Vto permit the filtered air to flow from the filtering material to thepassage" ways 15 and 16. i

The filter elements in the housing 1 constitute two filtering devices,designated A and B, in Fig. V. The passageway 15 is formed in thefiltering device A while the pessagcway 16 is located in the filteringdo vice B. I v

18 designates a division plate separating the passageway 15 from thepassageway 16.

The operation of the dust collector is as follows: The exhaust fan 8 isoperated to draw the dust laden air from the delivery pipe 3 to thefiltering devices A and B and the dust collects on the filteringmaterial 1 1: while the filtered air passing through said material isconducted through the passage 1 ways 15 and 16 and discharged into thesues tion pipes 6 and 7. In passing through the filtering devices theair is divided into two oppositely moving currents one of which flowsout through passageway 16 and sue: tion pipe 6 while the other passesthrough the passageway 15 and suction pi e 7 Each of the-suction pipes 6an 7 is pro vided with e va1ve'20 (Fig.1) which ma be closed to preventthe flow of air fromthe filtering devices to the exhaust fan 8. Thesevalves are open during the filtering operation. Each suction pipe isalso provided with an inlet opening located between. its valve 20 andthe filtering device, said opening being normally closed by a door orclosure 21. Each of these closures (Fig. VII) is preferably hinged to aframe 22 secured closing a valve in the delivery pipe 3,

(Fig. I) to plrevent the admission of dust laden air to t e housing 1;and closing the valve 20 in the suction pipe 6 and opening the door orclosure 21 on said suction pipe. The parts are then so positioned thatthe air supply cannot enter the housing through the main inlet opening2, and in response to the action of the exhaust fan air is drawn throughthe apparatus in the direction'indicated by the dotted arrows in Fig. Iand Fig.

. V. The air enters the suction pipe 6 through the inlet opening at thedoor 21 on said pipe as indicated by the dotted arrows in Fig; I

and this air flows into the housing 1 through the passageway 16 andfiltering device B in a direction opposite to the direction of flowduring the filtering process, see dotted arrows Fig. V. Therefore, thedust which has accumulated on the filtering material of the filteringdevice B is loosened and removed by the reverse air current flowingthrough said material. The air paming from the filtering device 13 fiowsthrough the filtering material of the filtering device .A and isdischarged through the suction pipe 7 leading to the exhaust fan. Thesuction fan may be operated with the parts positioned I as justdescribed for any desired length bf time to thoroughly cleanse thefiltering ma terial of the filtering device B, and the door or closure21 on the suction pipe 6 is thenclosed, and the valve 20 in the suctionp1 pe 6 and the valve 30 in the inlet pipe 3 are opened to permit theHow of air from the filtering devices through the suction pipe 6 to theexhaust fan 8. This places the parts in their normal positions, and mresponse to the operation of the fan the air currents will flow in thedirection indicated by the arrows shown in full lines Fig. T and Fig. V.It will be readily understood that the filtering device A may be.cleaned by closingthe valve 20 in the suction pipe and-opening the dooror closure 21 onsaid suction pipe. The direction of'fiow of the air inthe suction pipe 7 will then be reversed and the air current will flowfrom said suction pipe. through the filtering material of the filteringdevice A and finally pass from the housing 1 through the suction pipe 6.

My dust collector is preferably provided with a jarring device adaptedto shake or vibrate the filtering material when the direction of flow ofthe air is reversed to dislodge the dust from said material, and thejarring device is preferably so constructed that the filtering device Amay be vibrated independcntly cf the filtering device B. The object isto vibrate the filtering device through which the reverse air current isflowing without materially vibrating the other filtering device.

31 designates shaker bars connecting the frames of the filtering deviceA, and 32 designates similar bars connecting the frames of the filteringdevice B. Each filtering device is a yieldable structure which may bejarred by striking its shaker bars.

33 are hammers pivoted at 34, and 35 designates springs tending to pull.said hammers into engagement with the shaker bars 31.

Hammers 33 pivoted at 34 are pulled to- Ward the shaker bars 32 bysprings 35. The means for moving the hammers away from the shaker barscomprises rotatable shafts 36 journaled in bearings'on the side Walls ofthe housing land cam fingers 37 secured to said rotatable shafts. Thecam fingers lie adjacent to the inner ends of the pivoted hammers asshown most clearly in Fig. VI, and these cam fingers ma be rotated withthe result of moving the hammers away from the shaker bars andthereafter releasing the hammers to permit the springs 35 to pull saidhammers into engagement with the shaker bars. The means for driving thehammers at one side of the housing independently of the hammersat. theother side of the housing comprises sprocket wheels 38 secured to theshafts 36, sprocket wheels 39 loosely mounted on a drive shaft 41, and apair of sprocket chains 42 passing around the sprocket wheels 38 and 39.A clutch device 43 splined to the drive shaft 41 may be shifted intoengagement with clutch teeth on the sprocket wheels 39; lever forshifting the clutch member.

I claim 1. A dust collector comprising a housing having an inlet openingfor the admission of a dust laden air current, a plurality of filteringdevices arranged in said housing, each of said filtering devices beingprovided with an outlet passageway through which Iiltcrci'l air isdischarged, suction pipes com-' of said suction pipes to prevent an from1 The clutch device includes a shifter .7 terior of the filtering airduring a cleaning thereby removing runner flowing outwardly through theoutlet passageway of either of the filtering devices, normally closedclosures adapted to be opened after a filtering operution to admit airinto said outlet passu eways from the ex evices, the exhaust fan beingadapted to d *a-w air into one of the liltcring'devices from its outletpassageway and thence into the suction pipe asso ciated with the otherfiltering device.

2. A dust collector comprising a housing having an inlet opening for theadmission of a dust laden air current, and u plurality of outletopenings, filteringdevices between said inlet and outlet openings,suction pipes leading from ssid outlet openings adapted to receive airflowing from said filtering devices, an exhaust fan for drawing airthrough said suction pipes and the filtering devices associatedtherewith during the lil: tering operation, a valve for closing one ofthe suction pipes to prevent the'flo'w of air from a filtering" deviceto the said suction pipe, the last named suction pipe being providedwith an inlet openingt-hropgh which air inlay fiounfrom the exterior'ofsaid housing and a closure adapted to be opened; after the filteringoperation to admit a current of ,air from the exterior of the housinginto the last mentioned suction pipe, and means "for controllingthemovement of said air currents whereby the last mentioned air currententering a suction pipe is ceuscd to flow into and through a lteringdevice in response to the movement of an air current in anotherfiltering device.

3. A dust collector provided with filtering devices each having outletopening through which air is discharged during the filtering .operationand through which air is'admitted during the cleaning operation, suctionpipes leading from said outlet openings, each of said suction pipesbeing provided with an inlet opening for the adniissiim of operation,means for opening and closing said inlet openings, a suction device fordrawing hi1 through said suction pipes during the filtering and cleaningoperations, closures associated with said suction pipes to prevent theflow of air from either of the filtering devices to the suction pipeleading therefrom, said closures being mieruhle to permit the How of airthrough both of the suction pipes and to the suction device during thefiltering operation, and said closures being adopted to close one of thesuction pipes during the cleaning open utiou so that the air currentproduced in response to the operation of said suction device will flowthrough the filtering devices successively and into the other suctionpipe dust from one of the filterin'g devices.

4. A dust collector comprising a housing open to receive dust lode-nair, filtering de- SEE vices in said housing adapted. to receive the"dust, suction pipes communicating with ooth of said filtering devicesadapted to receive the filtered air, and a suction device for droningair through said suction pipes and filtering devices thereby drawingdust laden air to said filtering devices; conihined with means fordeflecting the air so that the air current produced in response to theoperation of said suction device will flow through the filtering devicessiiccessivoly and then through one of the suction pipes to said suctiondevice, thereby removing the dust from one of said filtering devices. I

5. A dust collector comprising {L housing open to receive dust ladenair, filtering de vices in said housing adapted to receive the dust,suction pipes communicating with both of said filteringdeviccs adaptedto receive the filtered air, and a suction device for drawing uirthrough said suction pipes und filtering devices thereby (ll'fl-WlIlgdust ludcn air to said filtering devices; combined with closuresassociated with said suction pipes for deflecting the air so that theair current produced in response to the operation of said suction devicewill flow into one of the suction pipes, through the filtering devicessucce sively and then through another of the suction pipes, therebyremov ing' the dust from one of said filtering dcvices. i (3. A dustcollector provided with filterlug devices ouch having an outlet opening"through which air is discharged during the filtering operations andalso during cleuning .perutions, and a suction fan, each of saidfiltering devices being provided with a suction pipe for conducting airto said suction fan during the filtering operations as well as duringcleaning operations, the dust receiving sides of said filtering devicesbeing in open couununication with each other so that dust is deliveredto all of said filtering devices at the same time in response to themovelnentoi' the air currents moving to said lan, combined withdeflectors for closing either of said suction pipes at a point betweensaid fan and filters and closures adapted to he opened to admit air tothe outlet opening of either of said filters, whereby either filteringdevice may be placed in con1- mun icution with'thc suction pipe ofanother filtering device so as to permit the flow oil. an air currentthrough the filtering devices successively and into the suction pipe ofone of the filtering devices in response to the operation of saidsuction fun.

7. A dust collector comprising a housing having on opening for thereception of dust laden air, two filtering devices in said housingadapted to receive the dust. uir conductin; members comu'nurinating withboth of soul filtering devices adapted to receive the filtered airflowing; from said filtering devices, and a suction device for drawingair I cessiveiy and thereafter through the other 10 through said airconducting members. and air conducting member to said suctiondefiltering devices thereby drawing dust laden vice, thereby removingthe dust, from one air to both of said filtering devices; comof saidfiltering devices. bined with means for deflecting the air so HENRYLEOHTENBERG that the air current produced in response to the operationof seid suction device will] In the presence offlow into one of said airconducting mem- H. G. SPRIGK, bers, then through the filtering devlcessuei G. A. LECHTENBERG.

